Tropical Depression 7 formed in the Atlantic Ocean late Thursday afternoon.

The system is 1155 miles east of the Windward Islands and heading west at about 20 mph.

Its maximum winds aren't terribly severe just yet, but it's possible it could become a tropical storm Friday, officials with the National Hurricane Center said.

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Meanwhile, Tropical Storm Ernesto continues to churn over Mexico.

And the National Oceanic and Atmospheric Administration adjusted its preseason prediction of a quieter-than-normal hurricane season. NOAA officials said Thursday that it now expects 12 to 17 tropical storms, and as many as eight hurricanes this season, which ends Nov. 30.